EP2042544B1 - Procédé de fabrication d'une composition de caoutchouc et pneu - Google Patents

Procédé de fabrication d'une composition de caoutchouc et pneu Download PDF

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Publication number
EP2042544B1
EP2042544B1 EP08015138.4A EP08015138A EP2042544B1 EP 2042544 B1 EP2042544 B1 EP 2042544B1 EP 08015138 A EP08015138 A EP 08015138A EP 2042544 B1 EP2042544 B1 EP 2042544B1
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EP
European Patent Office
Prior art keywords
silica
rubber composition
mass
parts
kneading
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP08015138.4A
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German (de)
English (en)
Other versions
EP2042544A1 (fr
Inventor
Kazuo Sumitomo Rubber Industries Ltd Hochi
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Publication date
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Publication of EP2042544A1 publication Critical patent/EP2042544A1/fr
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Expired - Fee Related legal-status Critical Current
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/203—Solid polymers with solid and/or liquid additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016—Compositions of the tread
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/37—Thiols
    • C08K5/372—Sulfides, e.g. R-(S)x-R'
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2321/00—Characterised by the use of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
    • C08L81/04—Polysulfides

Definitions

  • the present invention relates to a manufacturing method of a rubber composition that is superior in low heat build-up property and wear resistance, and a pneumatic tire in which the rubber composition is used in a tread.
  • Patent Document 1 a rubber composition is disclosed in which the rolling resistance performance, the wet skid performance, and the driving stability of a car are improved with good balance, that contains a total of 30 to 150 parts by mass of (a) silica with a nitrogen adsorption specific surface area of 100 m 2 /g or less and (b) silica with a nitrogen adsorption specific surface area of 180 m 2 /g or more to 100 parts by mass of a rubber component, and that satisfies the following formula.
  • Patent Document 2 a rubber composition for a tire is disclosed that contains 30 to 150 parts by mass of silica with a nitrogen adsorption specific surface area of 20 to 200 m 2 /g and a pH of 7.0 to 12.0 when it is dispersed into water and made into a 5% aqueous dispersion to 100 parts by mass of a rubber component in order to improve fuel economy, wet skid performance, wear resistance, and driving stability with good balance.
  • EP 1 878 590 A1 which is a prior art document under Art. 54 (3) EPC, discloses a rubber composition for covering a carcass cord comprising 25 to 80 parts by mass of silica, 1 to 15 parts by mass of a silane coupling agent and 3 to 30 parts by mass of a specific organic vulcanizing agent.
  • EP 1 077 228 A1 relates to a pneumatic tire having a rubber component comprising of 100 parts by weight of at least one elastomer containing olefinic unsaturation and 1 to 20 phr of a liquid organic polysulfide polymer according to a specific formula and having a molecular weight between 500 and 10,000.
  • the present invention provides a manufacturing method of a rubber composition that is superior in low heat build-up property and wear resistance and a pneumatic tire in which the rubber composition obtained by the manufacturing method is used in a tread.
  • the present invention provides a manufacturing method for a pneumatic tire, wherein a rubber composition is used in the tread of the pneumatic tire, wherein the rubber composition contains 30 to 150 parts by mass of silica and 0.5 to 10 parts by mass of an organic vulcanization agent to 100 parts by mass of a rubber component, wherein the method comprises a first kneading step of kneading the organic vulcanization agent and silica into the rubber component, and a second kneading step of kneading thereafter a vulcanization agent and a vulcanization accelerator into the kneaded product obtained in the first kneading step, wherein the organic vulcanization agent is represented by the following general formula (1): R t ⁇ R ⁇ S x n ⁇ R 2 in which R is (CH 2 -CH 2 -O) m -CH 2 -CH, and R 1 and R 2 are independently hydrogen, a methyl group, a thiol
  • the kneading temperature of the above-described first kneading step is desirably in the range of 120°C to 160°C
  • the kneading temperature of the second kneading step is desirably in the range of 70°C to 100°C.
  • the present invention further relates to a rubber composition obtained by the above-described manufacturing method and a pneumatic tire using the rubber composition in a tread.
  • the dispersibility of silica in the rubber composition is improved due to an interaction of the organic vulcanization agent and silica by performing kneading of the organic vulcanization agent and silica into the rubber component in the first kneading step. Further, bonding or an interaction of the organic vulcanization agent adsorbed on the surface of the silica and the rubber molecules is assumed to occur, and as a result, a rubber composition that is superior in low heat build-up property and wear resistance can be obtained.
  • the present invention provides a manufacturing method for a pneumatic tire, wherein a rubber composition is used in the tread of the pneumatic tire, wherein the rubber composition contains 30 to 150 parts by mass of silica and 0.5 to 10 parts by mass of an organic vulcanization agent represented by the above-described general formula (1) to 100 parts by mass of a rubber component.
  • the manufacturing method includes a first kneading step and a second kneading step.
  • silica and the organic vulcanization agent are compounded at the same time into the rubber component or the organic vulcanizing agent is added after silica is compounded and kneaded into the rubber component.
  • Other compounding agents excluding a vulcanization agent such as sulfur and a vulcanization accelerator, such as carbon black, a silane coupling agent, zinc oxide, stearic acid, an antioxidant, a wax, and aromatic oil, can be kneaded at the same time with silica and the organic vulcanization agent. However, they can be added and kneaded after silica and the organic vulcanization agent are kneaded sufficiently.
  • the first kneading step is desirably performed at a temperature in the range of 120°C to 160°C for 2 to 10 minutes using a Banbury mixer or the like.
  • a temperature in the range of 120°C to 160°C for 2 to 10 minutes using a Banbury mixer or the like.
  • the kneading is continued by further adding a vulcanization agent such as sulfur and a vulcanization accelerator into the kneaded product after the above-described first kneading step.
  • a vulcanization agent such as sulfur and a vulcanization accelerator
  • the second kneading step is desirably performed at a temperature in the range of 70°C to 100°C for 2 to 8 minutes using a roll or the like. Because vulcanization of the rubber proceeds due to sulfur when the kneading temperature exceeds 100°C, molding thereafter becomes difficult. It is possible to appropriately compound the organic vulcanization agent represented by the above-described general formula (1) and use sulfur in combination in the second kneading step.
  • the rubber component is preferably a diene rubber.
  • the diene rubber include a natural rubber (NR), an isoprene rubber (IR), a butadiene rubber (BR), a styrene-butadiene rubber (SBR), an acrylonitrile-butadiene rubber (NBR), a chloroprene rubber (CR), a butyl rubber (IIR), and a styrene-isoprene-butadiene copolymer rubber (SIBR).
  • NR natural rubber
  • IR isoprene rubber
  • BR butadiene rubber
  • SBR styrene-butadiene rubber
  • NBR acrylonitrile-butadiene rubber
  • CR chloroprene rubber
  • IIR butyl rubber
  • SIBR styrene-isoprene-butadiene copolymer rubber
  • the above-described organic vulcanization agent is a compound satisfying the following general formula (1): R 1 ⁇ R ⁇ S x n ⁇ R 2 (wherein R is (CH Z -CH 2 -O) m -CH 2 -CH, and R 1 and R 2 are independently hydrogen, a methyl group, a thiol group, a hydroxy group, a carboxyl group, or an aldehyde group, X is an integer of 3 to 6, n is an integer of 10 to 400, and m is an integer of 1 to 5).
  • x is preferably 3 to 6, and more preferably 3 to 5.
  • x is less than 3, the vulcanization tends to be slow. Further, when x exceeds 6, the manufacturing of the rubber composition tends to become difficult.
  • n is preferably an integer of 10 to 400, and more preferably an integer of 10 to 300.
  • n is less than 10, the organic vulcanization agent tends to evaporate easily, and the handling tends to become difficult. Further, when n exceeds 400, compatibility of the organic vulcanization agent with the rubber tends to deteriorate.
  • m is preferably an integer of 2 to 5, more preferably an integer of 2 to 4, and further preferably an integer of 2 to 3.
  • m is less than 2, the bending resistance performance tends to deteriorate. Further, when m exceeds 5, the hardness of the rubber composition tends to become insufficient.
  • the content of the organic vulcanization agent is preferably 0.5 parts by mass or more to 100 parts by mass of a rubber component, more preferably 1 part by mass or more, and further preferably 2 parts by mass or more.
  • the content of the organic vulcanization agent is less than 0.5 parts by mass, the wear resistance tends to deteriorate.
  • the content of the organic vulcanization agent is preferably 30 parts by mass or less, and more preferably 25 parts by mass or less.
  • the content of the organic vulcanization agent exceeds 30 parts by mass, the hardness increases excessively, and the grip performance tends to deteriorate.
  • Silica in the rubber composition of the present invention bonds chemically or physically, or forms a complex by being kneaded with the organic vulcanization agent preliminarily, and disperses uniformly in a matrix of the rubber component.
  • the type of silica is not limited as long as it has such a function, and dry method silica (silicic anhydride), wet method silica (silicic anhydride), and the like may be used for example. Especially, wet method silica having many silanol groups on the surface and high reactivity with a silane coupling agent is preferable.
  • the nitrogen adsorption specific surface area (N 2 SA) of silica is 20 m 2 /g or more, and preferably 40 m 2 /g or more.
  • N 2 SA of silica When N 2 SA of silica is less than 20 m 2 /g, the wear resistance decreases. Further, N 2 SA of silica is 200 m 2 /g or less. When N 2 SA of silica exceeds 200 m 2 /g, the wet grip performance deteriorates.
  • the pH when silica is dispersed into water and made into a 5% aqueous dispersion is 7.0 or more, preferably 7.5 or more, and more preferably 8.0 or more.
  • 5%pH of silica is less than 7.0, a coupling reaction with the silane coupling agent is not promoted, and improvements in both the fuel economy and the wet grip performance are not achieved simultaneously.
  • the 5%pH of silica is 12.0 or less, preferably 11.5 or less, and more preferably 11.0 or less. When the 5%pH of silica exceeds 12.0, the scorch time becomes short and the processability deteriorates.
  • the content of silica is 30 parts by mass or more, and preferably 45 parts by mass or more to 100 parts by mass of the rubber component. When the content of silica is less than 30 parts by mass, sufficient improvement effects by compounding silica cannot be obtained. Further, the content of silica is 150 parts by mass or less, and preferably 120 parts by mass or less. When the content of silica exceeds 150 parts by mass, dispersion of silica into the rubber becomes difficult, and the processability of the rubber deteriorates.
  • the fuel economy improves as compared with the case where conventional silica is compounded.
  • the silane coupling agent is preferably used together with silica in the above-described rubber composition.
  • a silane coupling agent that has been conventionally generally used together with silica can be used as the silane coupling agent in the present invention.
  • Examples thereof include bis(3-triethoxysilylpropyl)polysulfide, bis(2-triethoxysilylethyl)polysulfide, bis(3-trimethoxysilylpropyl)polysulfide, bis(2-trimethoxysilylethyl)polysulfide, bis(4-triethoxysilylbutyl)polysulfide, and bis(4-trimethoxysilylbutyl)polysulfide, and these silane coupling agents may be used alone, or two or more types may be combined and used.
  • Bis(3-triethoxysilylpropyl)disulfide and the like are preferably used.
  • the content of the silane coupling agent is preferably 0.5 parts by mass or more, and more preferably 1 part by mass or more to 100 parts by mass of silica.
  • the content of the silane coupling agent is preferably 10 parts by mass or less, and more preferably 15 parts by mass or less.
  • the content of the silane coupling agent exceeds 10 parts by mass, bleeding tends to occur.
  • the rubber composition of the present invention can contain carbon black, a reinforcing filler other than silica such as clay, an antioxidant, a softener, zinc oxide, stearic acid, a wax, a vulcanization agent other than an organic vulcanization agent, a silane coupling agent, a vulcanization accelerator, a process aid, and the like at a normally used amount depending on necessity.
  • the tire of the present invention is preferably made from the above-described rubber composition.
  • the pneumatic tire in accordance with the present inventions has a tread using the rubber composition.
  • the tread can be produced by a method of pasting a sheet-shaped rubber composition together in a prescribed shape or a method of inserting the rubber composition in an extruder having two or more tubes and forming the rubber composition into two layers at a head outlet of the extruder.
  • a rubber composition can be obtained in which the reinforcing effect of the rubber composition is improved and that is superior in low heat build-up property and wear resistance, and a pneumatic tire in which the rubber composition is used in a tread has excellent rolling resistance and contributes to low fuel consumption.
  • a rubber composition was kneaded in the following two steps based on the compounding content shown in Table 1.
  • the compounding content shows parts by mass to 100 parts by mass of a rubber component.
  • Silica, an organic vulcanization agent, a silane coupling agent, zinc oxide, stearic acid, an antioxidant, a wax, and aromatic oil were compounded into a rubber component of an SBR and a BR based on the compounding table shown in Table 1, and the mixture was kneaded at 150°C for 3 minutes using a Banbury mixer.
  • a tire for testing (tire size: 195/65R15) was manufactured by molding the non-vulcanized rubber composition into a tread shape, pasting the rubber composition together with other tire members, and press vulcanizing them at 160°C for 20 minutes.
  • a test tire was put on the above-described testing vehicle.
  • the test vehivle was run on a test course of an asphalt road surface at 80 km/h, and the remaining groove value after a 30000 km run was measured.
  • the wear resistance index of each compounding ingredient was obtained based on the following formula with the wear resistance index of a standard compounding ingredient being 100. The larger the index value is, the superior the wear resistance is.
  • the remaining groove value after a run means the depth of the tread groove of the test tire that was put on.
  • Wear Resistance Index Remaining Groove Value of Each Compounding Ingredient / Remaining Groove Value of Standard Compounding Ingredient ⁇ 100
  • Examples 1 to 2 and Comparative Examples 1 to 3 The evaluation results of the rolling resistance performance and the wear resistance in Examples 1 to 2 and Comparative Examples 1 to 3 are shown in Table 1.
  • Both of Examples 1 and 2 are products obtained by kneading the organic vulcanization agent and silica into the rubber component in the first kneading step, and rubber compositions that are superior in low heat build-up property and wear resistance were obtained compared with Comparative Example 1 in which the organic vulcanization agent was compounded in the second kneading step.
  • Comparative Examples 2 and 3 are rubber compositions in which the organic vulcanization agent was not compounded, and both are inferior in low heat build-up property and wear resistance.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Tires In General (AREA)

Claims (2)

  1. Procédé de fabrication d'un pneumatique, selon lequel une composition de caoutchouc est utilisée dans la bande de roulement du pneumatique,
    selon lequel la composition de caoutchouc contient de 30 à 150 parts en masse de silice et de 0,5 à 10 parts en masse d'un agent de vulcanisation organique pour 100 parts en masse d'un composant de caoutchouc, le procédé comportant
    une première étape de malaxage destinée à malaxer l'agent de vulcanisation organique et la silice dans le composant de caoutchouc, et
    une deuxième étape de malaxage destinée à malaxer ensuite un agent de vulcanisation et un accélérateur de vulcanisation dans le produit malaxé obtenu dans la première étape de malaxage, selon lequel
    l'agent de vulcanisation organique est représenté par la formule générale suivante (1) :

            R1-(R-Sx)n-R2     (1),

    dans laquelle R est (CH2-CH2-O)m-CH2-CH, et R1 et R2 sont de manière indépendante de l'hydrogène, un groupe méthyle, un groupe thiol, un groupe hydroxy, un groupe carboxyle, ou un groupe aldéhyde, X est un entier de 3 à 6, n est un entier de 10 à 400, et m est un nombre entier de 1 à 5.
  2. Procédé de fabrication d'un pneumatique selon la revendication 1, selon lequel la température de malaxage de la première étape de malaxage est de l'ordre de 120°C à 160°C, et la température de malaxage de la deuxième étape de malaxage est de l'ordre de 70°C à 100°C.
EP08015138.4A 2007-09-27 2008-08-27 Procédé de fabrication d'une composition de caoutchouc et pneu Expired - Fee Related EP2042544B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007251404A JP5147346B2 (ja) 2007-09-27 2007-09-27 ゴム組成物の製造方法および空気入りタイヤ

Publications (2)

Publication Number Publication Date
EP2042544A1 EP2042544A1 (fr) 2009-04-01
EP2042544B1 true EP2042544B1 (fr) 2016-10-26

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US (1) US20090084476A1 (fr)
EP (1) EP2042544B1 (fr)
JP (1) JP5147346B2 (fr)
CN (1) CN101397379A (fr)

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RU2479604C2 (ru) * 2009-11-12 2013-04-20 Владимир Павлович Лобко Способ изготовления резиновой смеси для автомобильной шины
RU2471820C2 (ru) * 2009-11-12 2013-01-10 Владимир Павлович Лобко Способ изготовления резиновой смеси для автомобильной шины
RU2479603C2 (ru) * 2009-11-12 2013-04-20 Владимир Павлович Лобко Способ изготовления резиновой смеси для автомобильной шины
DE102012010317A1 (de) * 2011-06-01 2012-12-06 Sumitomo Chemical Co., Ltd. Verfahren zur Herstellung einer Kautschukzusammensetzung
JP6008479B2 (ja) * 2011-08-19 2016-10-19 株式会社ブリヂストン タイヤ及びその製造方法、並びに、該タイヤの製造方法に用いた補修用ゴム部材
JP5977517B2 (ja) * 2011-12-26 2016-08-24 株式会社ブリヂストン ゴム組成物の製造方法、そのゴム組成物及びそれを用いた空気入りタイヤ
JP6345971B2 (ja) * 2014-04-09 2018-06-20 住友ゴム工業株式会社 空気入りタイヤ
CN105315611A (zh) * 2015-09-23 2016-02-10 苏州国泰科技发展有限公司 一种汽车轮胎橡胶制备用硫化剂
CN105315606A (zh) * 2015-09-23 2016-02-10 苏州国泰科技发展有限公司 一种应用于汽车轮胎中的硫化剂的制备方法
EP3348427B1 (fr) * 2015-10-27 2020-07-08 Sumitomo Rubber Industries, Ltd. Bandage pneumatique et composition de caoutchouc réticulé
CN105837883A (zh) * 2016-05-19 2016-08-10 张家港大塚化学有限公司 橡胶组合物和轮胎组件
KR102603733B1 (ko) * 2021-10-06 2023-11-21 넥센타이어 주식회사 타이어 고무 조성물 제조 방법, 이로부터 제조된 타이어 트레드 고무 조성물 및 이를 포함하는 타이어

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CA2311437A1 (fr) * 1999-08-17 2001-02-17 Marc Jules Alexis Henoumont Pneu dont l'element caoutchouc comporte un compose de polysulfide liquide
BR0116626A (pt) * 2001-10-30 2003-12-23 Pirelli Pneumático para rodas de veìculo, composição elastomérica, banda de rodagem para pneumáticos de roda de veìculo, e, artigo fabricado elastomérico reticulado
US20060173118A1 (en) * 2005-01-28 2006-08-03 Sumitomo Rubber Industries, Ltd. Rubber composition and tire having tread comprising thereof
JP4566888B2 (ja) * 2005-01-28 2010-10-20 住友ゴム工業株式会社 ゴム組成物およびそれを用いたトレッドを有するタイヤ
US8039538B2 (en) * 2005-12-01 2011-10-18 Sumitomo Rubber Industries, Ltd. Rubber composition for a tire and tire having a tread using the same
JP5117035B2 (ja) 2005-12-01 2013-01-09 住友ゴム工業株式会社 タイヤ用ゴム組成物およびそれを用いたトレッドを有するタイヤ
JP2007251404A (ja) 2006-03-14 2007-09-27 Mitsubishi Electric Corp 信号読み出し回路及びイメージセンサ
JP5101907B2 (ja) * 2006-04-06 2012-12-19 住友ゴム工業株式会社 スチールコード被覆用ゴム組成物およびそれを用いたタイヤ
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US7470742B2 (en) * 2006-07-13 2008-12-30 Sumitomo Rubber Industries, Ltd. Rubber composition for covering carcass cord and tire having carcass using same
JP5073583B2 (ja) * 2007-09-05 2012-11-14 住友ゴム工業株式会社 スタッドレスタイヤ用ゴム組成物およびそれを用いたスタッドレスタイヤ

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US20090084476A1 (en) 2009-04-02
JP2009079194A (ja) 2009-04-16
JP5147346B2 (ja) 2013-02-20
CN101397379A (zh) 2009-04-01
EP2042544A1 (fr) 2009-04-01

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